AragoniteCaCO3
Class: Carbonate Hardness: 3.5 - 4 Streak: White Lustre: Vitreous Habit: Stalactitic aggregate of crystals or grains. Colours: Colourless or white | | Crystal System: Orthorhombic Cleavage: Pinacoidal Fracture: Subconchoidal Magnetism: None Reaction with HCl: Strong | Identification in hand sample: Stalactitic habit, hardness (greater than that of calcite) and colour. Associations: Occurs in carbonate-bearing blueschist metamorphic rocks. Associated with glaucophane, lawsonite, pumpellyite. Also forms at or near the surface in cave and hot spring deposits. Industrial / ecomonic uses: Same as calcite, however abundance is much much less than that of calcite, thus having little economic value. |